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Where are reactants found in a chemical reaction equation?
to the left of the yield arrow.
A substance made up of two or more different chemical elements combined in a fixed ratio.
Compound
Why is cooking an egg an example of a chemical change?
The heat breaks and creates chemical bonds, transforming the liquid proteins into a new solid structure.
What is the total mass of the products for the following chemical reaction:
Red Mercury (II)(s) → Mercury(l) + Oxygen(g)
15.00 g → 10.35 g + Oxygen(g)
15.00 g
A change in which the substance is altered but the composition is unchanged.
Physical Change
Calculate the percent by mass of Chlorine in table salt by referencing the following data (3 sig figs):
Mass of Sodium: 23 g
Mass of Chloride: 35 g
total Mass: 58 g
60.3 %
What is the ratio of oxygen to hydrogen in a water molecule?
1 O : 2 H
1: 2
Matter that can be observed or measured without changing the sample’s composition.
Physical Property
Calculate the percent by mass of sodium in table salt by referencing the following data (3 sig figs):
Mass of Sodium: 137.9 g
Mass of Chloride: 212.7 g
total Mass: 350.6 g
39.3 %
How is a matcha latte an example of a homogeneous mixture?
Its composition is uniform throughout
The ability for a substance to combine with or change into one or more other substances.
Chemical Property
How can you separate hydrogen from oxygen in a pure water molecule?
Use a process called electrolysis, which passes an electric current through the liquid to split the molecules
How is mud an example of a heterogeneous mixture?
Its solid particles and liquid components are not evenly mixed and can separate over time
Process that involves one or more substances changing into new substances.
Chemical Change
During the ice cream lab, why did the ice melt, yet the ice solution felt colder?
Salt lowered the freezing point of the ice, causing it to melt while absorbing heat from its surroundings. This made the ice-salt mixture colder than regular ice.